Results 1 to 10 of about 1,387,580 (319)

Internal and External Alignment of Carbonaceous Grains within the Radiative Torque Paradigm [PDF]

Astrophysical Journal, 2023
We study the internal and external alignment of carbonaceous grains in the interstellar medium (ISM) within the Radiative Torque (RAT) paradigm.
Thiem Hoang, Le Ngoc Tram
exaly   +12 more sources

Carbonaceous dust grains seen in the first billion years of cosmic time [PDF]

Nature, 2023
An (ultraviolet) dust attenuation feature at 2,175 Å, attributed to carbonaceous dust grains in the Milky Way and nearby galaxies, also exists in galaxies up to a redshift of 7. Large dust reservoirs (up to approximately 10^8  M _⊙) have been detected^ 1
Joris Witstok, Irene Shivaei, Renske Smit, R. Maiolino, Stefano Carniani, Emma Curtis-Lake, Pierre Ferruit, Santiago Arribas, Andrew J. Bunker, Alex J. Cameron, S. Charlot, Jacopo Chevallard, Mirko Curti, Anna de Graaff, Francesco D’Eugenio, Giovanna Giardino, Tobias J. Looser, Tim Rawle, Bruno Rodríguez Del Pino, Chris J. Willott, Stacey Alberts, William Baker, Kristan Boyett, Eiichi Egami, Daniel J. Eisenstein, Ryan Endsley, Kevin Hainline, Zhiyuan Ji, Benjamin D. Johnson, Nimisha Kumari, Jianwei Lyu, Erica J. Nelson, Michele Perna, Marcia Rieke, Brant Robertson, Lester Sandles, Aayush Saxena, Jan Scholtz, Fengwu Sun, Sandro Tacchella, Christina C. Williams, Christopher N. A. Willmer   +41 more
semanticscholar   +26 more sources

Origin of isolated olivine grains in carbonaceous chondrites [PDF]

Meteoritics & Planetary Science, 2020
We report microscopic, cathodoluminescence, chemical, and O isotopic measurements of FeO‐poor isolated olivine grains (IOG) in the carbonaceous chondrites Allende (CV3), Northwest Africa 5958 (C2‐ung), Northwest Africa 11086 (CM2‐an), and Allan Hills ...
Emmanuel Jacquet, Maxime Piralla, Pauline Kersaho, Yves Marrocchi   +3 more
semanticscholar   +8 more sources

Carbonaceous dust grains in luminous infrared galaxies [PDF]

Astronomy and Astrophysics, 2007
[Conclusions] These observations further demonstrate the ubiquitousness of a-C:H in the diffuse interstellar medium (DISM) of galaxies, for a long time almost only observed in the Milky-Way ISM lines-of-sights. Whereas PAH emission lines trace the re-processing of energetic young stellar radiation, the observed a-C:H features underline the existence of
E Dartois
exaly   +6 more sources

Laboratory Experiments on the Low-temperature Formation of Carbonaceous Grains in the ISM [PDF]

Astrophysical Journal, Supplement Series, 2017
The life cycle of cosmic dust grains is far from being understood and the origin and evolution of interstellar medium (ISM) grains is still under debate.
D Fulvio, Sándor Gobi, C Jäger
exaly   +7 more sources

Variations of organic functional chemistry in carbonaceous matter from the asteroid 162173 Ryugu [PDF]

Nature Communications
Primordial carbon delivered to the early earth by asteroids and meteorites provided a diverse source of extraterrestrial organics from pre-existing simple organic compounds, complex solar-irradiated macromolecules, and macromolecules from extended ...
Bradley De Gregorio, George D. Cody, Rhonda M. Stroud, A. L. David Kilcoyne, Scott Sandford, Corentin Le Guillou, Larry R. Nittler, Jens Barosch, Hikaru Yabuta, Zita Martins, Yoko Kebukawa, Taiga Okumura, Minako Hashiguchi, Shohei Yamashita, Yasuo Takeichi, Yoshio Takahashi, Daisuke Wakabayashi, Cécile Engrand, Laure Bejach, Lydie Bonal, Eric Quirico, Laurent Remusat, Jean Duprat, Maximilien Verdier-Paoletti, Smail Mostefaoui, Mutsumi Komatsu, Jérémie Mathurin, Alexandre Dazzi, Ariane Deniset-Besseau, Emmanuel Dartois, Yusuke Tamenori, Hiroki Suga, Gilles Montagnac, Kanami Kamide, Miho Shigenaka, Megumi Matsumoto, Yuma Enokido, Makoto Yoshikawa, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Satoru Nakazawa, Tomohiro Usui, Masanao Abe, Tatsuaki Okada, Toru Yada, Masahiro Nishimura, Aiko Nakato, Akiko Miyazaki, Kasumi Yogata, Hisayoshi Yurimoto, Tomoki Nakamura, Takaaki Noguchi, Ryuji Okazaki, Hiroshi Naraoka, Kanako Sakamoto, Shogo Tachibana, Sei-ichiro Watanabe, Yuichi Tsuda   +58 more
doaj   +5 more sources

Characterization of Presolar Silicate and Oxide Grains in Primitive Carbonaceous Chondrites [PDF]

Astrophysical Journal, 2007
Raster ion imaging of the oxygen isotopes with the NanoSIMS ion microprobe has been used to identify presolar grains in two primitive meteorites. Eleven presolar silicates and eight presolar oxides were identified in the primitive carbonaceous chondrite Acfer 094 for abundances of 325 and 360 parts per million (ppm), respectively.
Ann N Nguyen, Frank J Stadermann, Ernst Zinner   +2 more
exaly   +4 more sources

Presolar grains in primitive ungrouped carbonaceous chondrite Northwest Africa 5958 [PDF]

Meteoritics & Planetary Science, 2019
We report a correlated NanoSIMS‐transmission electron microscopy study of the ungrouped carbonaceous chondrite Northwest Africa (NWA) 5958. We identified 10 presolar SiC grains, 2 likely presolar graphite grains, and 20 presolar silicate and/or oxide ...
L. R. Nittler, R. M. Stroud, C. M. O'd. Alexander, Kaitlin Howell   +3 more
semanticscholar   +6 more sources

Simulation of Infrared Spectra of Carbonaceous Grains [PDF]

Astrophysical Journal, 1997
Random covalent network (RCN) theory is applied to describe the infrared spectroscopic properties of carbonaceous solids with compositions containing a mixture of aromatic, aliphatic, and diamond-like hydrocarbons. Application of this technique to carbonaceous dust is equivalent to the synthesis of solids whose structure and bonding satisfy ...
G. Dadswell, W. Duley
exaly   +3 more sources

Low-temperature Formation of Carbonaceous Dust Grains from PAHs

Astrophysical Journal, 2020
Carbon is ubiquitous in space and plays a key role in prebiotic chemistry. Astronomical observations have found interstellar carbon in the form of polycyclic aromatic hydrocarbons (PAHs) as well as carbonaceous dust, confirming its presence in both ...
Lisseth Gavilan, Salma Bejaoui, Michael R Häggmark   +2 more
exaly   +3 more sources